Sayyidina Abu Bakrah (RA) reported that Allah’s Messenger ﷺ said, “Shall I not tell you of the gravest of major sins?” The sahabah said, “Of course, O Messenger of Allah ﷺ .” He said, “To associate partner with Allah and to disobey parents.” He had been reclining, but sat up straight and added, “And a false testimony” or, he said, “A false word.” AIlah’a Messenger ﷺ did not cease to say that till they hoped that he would stop. [Bukhari 2654, Muslim 87]